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CSS Layout - 如何創(chuàng)建CSS工具提示...

我們想知道如何創(chuàng)建CSS工具提示。... 

<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.big {
  overflow: auto;
  position: relative;
  border: 1px solid;
}

.middle_left {
  border: 1px solid;
  position: absolute;
  bottom: 0;
}

.middle_right {
  float: right;
  border: 1px solid;
  line-height: 48px;
}
</style>
</head>
<body>
  <div class="big">
    <div class="middle_left">Small left</div>
    <div class="middle_right">Big right</div>
  </div>
</body>
</html>